You need one of those tv tuner add-in cards for the pc. these are usually pci type of card that goes inside your pc. If you dont want to open up your pc, there are also usb type/model of these tv tuner. they also come with their own drivers and tv viewing software

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Let's check the obvious first...
Make sure monitor cables are attached correctly and securely.
Is the monitor receiving power/turned on?
Assuming monitor was working at some point and not damaged...

Start up PC in safe mode (press F5 key when you see Windows logo at startup). This will use a default VGA driver. If LCD works now, you may need to check for and replace the video driver for the monitor. Go to the manufacturer's website for the monitor. If LCD does not work, I suspect a hardware failure in the LCD monitor.

If this is a new, under warranty, you can take back to place of purchase for an exchange. Receipt may be required. If not under warranty, you may be looking at buying a new monitor. LCD have come down in price. My recommendation would be the Samsung SyncMaster. 15 inch size is cheapest. 17 inch have become very competitive. 19 inch and up can be expensive depending on brand. Watch for sales. Local club stores like Sam's or Costco sometimes have deals, too. Of course, their are online sources too like newegg.com.

It will be compatible with the system, just keep on thing in mind, whatever resolution you set your computer at you may have to keep the ratio aspect active so that way the screen looks properly displayed.